Alfred Cellier (1820-1891) was a British composer and conductor known primarily for his contributions to the genre of light opera and musical theatre in the Victorian era. He worked closely with the renowned Gilbert and Sullivan, serving as the conductor for several of their works, and he also composed his own operas. Cellier's most notable works include "Dorothy," which premiered in 1886, and "The Mountebanks," which was well-received in 1892. Both operas featured his distinctive melodic style and wit, characteristics that resonated with audiences of the time. "Dorothy" became particularly popular for its catchy tunes and engaging storyline, marking it as one of the significant light operas of the period. Although not as widely recognized as Gilbert and Sullivan, Cellier's contributions to the genre helped lay the groundwork for the development of British musical theatre. His works remain a testament to the evolution of light opera in the late 19th century, blending humor, romance, and catchy melodies, which influenced subsequent composers in the genre. His legacy is often overshadowed, but his impact on musical theatre and light opera is an important facet of Victorian music history.